DoubleClick Inc. was an American advertisement company that developed and provided Internet ad serving services from 1995 until its acquisition by Google in March 2008.

DoubleClick offered technology products and services that were sold primarily to advertising agencies and mass media, serving businesses like Microsoft, General Motors, Coca-Cola, Motorola, L'Oréal, Palm, Inc., Apple Inc., Visa Inc., Nike, Inc., and Carlsberg Group.

Poppe Tyson had created an Interactive Sales division, but lacked the technology to deliver online ads across its network of client's sites.

[16] Privacy groups complained that DoubleClick's plan to combine its online profiling information with offline information gathered by Abacus Direct would violate privacy rules, including the Stored Communications Act, the Wiretap Statute, and the Computer Fraud and Abuse Act, as it would allow the company to match a person's identity with their online habits, which it tracks through cookies.

[18] The investigation was concluded in January 2001, with the FTC stating that it found no evidence that DoubleClick used or disclosed consumers personal identifying information.

[19][20] DoubleClick eventually entered into a settlement agreement where DoubleClick was required to explain its privacy policy in "easy-to-read" language; conduct a public information campaign consisting of 300 million banner ads inviting consumers to learn more about protecting their privacy; and institute data purging and opt-in procedures among other requirements.

In May 2007, the FTC requested additional information about the deal after it was urged by competitors, including Microsoft, which believed it would give Google too much control over online advertising.

[35] In November 2007, shortly after the announcement of the acquisition, it was reported that DoubleClick had been serving ads designed to trick users into buying malware.